EVALUATION OF COATINGS ON COASTAL STEEL BRIDGES, 16-YEAR PERIOD

DURING THE PERIOD 1952--1968 THE CALIFORNIA DIVISION OF HIGHWAYS INVESTIGATED A BROAD SPECTRUM OF PRIMER AND FINISHING PAINTS TO COMBAT CORROSION OF STEEL BRIDGES IN A MARINE ENVIRONMENT. PARTICULAR ATTENTION IS GIVEN TO THE LEFFINGWELL AND SAN SIMEON CREEK BRIDGES, WHICH SINCE THEIR CONSTRUCTION IN 1932 HAD REQUIRED REPAINTING EVERY 3--4 YEARS WITH THE SAME PAINTS THAT LASTED 25--30 YEARS ON INLAND STRUCTURES. AFTER 10 YEARS (1962), TEST SECTIONS OF THE TWO BRIDGES SHOWED THAT THE BEST SYSTEM WAS AN INORGANIC POST-CURE ZINC-PIGMENTED SODIUM SILICATE PRIMER HAVING A VINYL FINISH COAT. THIS SYSTEM WAS RATED 9+, WITH 10 BEING PERFECT. THE EVALUATION OF THE INORGANIC SELF-CURE ZINC-PIGMENTED SILICATE PRIMERS WILL NOT BE COMPLETE FOR 6--10 YEARS. ALL OTHER SYSTEMS PROVIDED DEFINITELY INFERIOR PROTECTION, THE NEXT BEST BEING AN ALL-VINYL TYPE. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures;
  • Pagination: pp 34-40
  • Monograph Title: Joint sealants, paint and pipe
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00217040
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Dec 28 1970 12:00AM